target/linux/brcm2708/patches-4.1/0016-lirc-added-support-for-RaspberryPi-GPIO.patch

   1 From e074d656e4011eae32577e4d20d7ce6dfa15f6e8 Mon Sep 17 00:00:00 2001
   2 From: Aron Szabo <aron@aron.ws>
   3 Date: Sat, 16 Jun 2012 12:15:55 +0200
   4 Subject: [PATCH 016/121] lirc: added support for RaspberryPi GPIO
   5
   6 lirc_rpi: Use read_current_timer to determine transmitter delay. Thanks to jjmz and others
   7 See: https://github.com/raspberrypi/linux/issues/525
   8
   9 lirc: Remove restriction on gpio pins that can be used with lirc
  10
  11 Compute Module, for example could use different pins
  12
  13 lirc_rpi: Add parameter to specify input pin pull
  14
  15 Depending on the connected IR circuitry it might be desirable to change the
  16 gpios internal pull from it pull-down default behaviour. Add a module
  17 parameter to allow the user to set it explicitly.
  18
  19 Signed-off-by: Julian Scheel <julian@jusst.de>
  20
  21 lirc-rpi: Use the higher-level irq control functions
  22
  23 This module used to access the irq_chip methods of the
  24 gpio controller directly, rather than going through the
  25 standard enable_irq/irq_set_irq_type functions. This
  26 caused problems on pinctrl-bcm2835 which only implements
  27 the irq_enable/disable methods and not irq_unmask/mask.
  28
  29 lirc-rpi: Correct the interrupt usage
  30
  31 1) Correct the use of enable_irq (i.e. don't call it so often)
  32 2) Correct the shutdown sequence.
  33 3) Avoid a bcm2708_gpio driver quirk by setting the irq flags earlier
  34
  35 lirc-rpi: use getnstimeofday instead of read_current_timer
  36
  37 read_current_timer isn't guaranteed to return values in
  38 microseconds, and indeed it doesn't on a Pi2.
  39
  40 Issue: linux#827
  41
  42 lirc-rpi: Add device tree support, and a suitable overlay
  43
  44 The overlay supports DT parameters that match the old module
  45 parameters, except that gpio_in_pull should be set using the
  46 strings "up", "down" or "off".
  47
  48 lirc-rpi: Also support pinctrl-bcm2835 in non-DT mode
  49 ---
  50  drivers/staging/media/lirc/Kconfig    |   6 +
  51  drivers/staging/media/lirc/Makefile   |   1 +
  52  drivers/staging/media/lirc/lirc_rpi.c | 765 ++++++++++++++++++++++++++++++++++
  53  3 files changed, 772 insertions(+)
  54  create mode 100644 drivers/staging/media/lirc/lirc_rpi.c
  55
  56 --- a/drivers/staging/media/lirc/Kconfig
  57 +++ b/drivers/staging/media/lirc/Kconfig
  58 @@ -32,6 +32,12 @@ config LIRC_PARALLEL
  59         help
  60           Driver for Homebrew Parallel Port Receivers
  61
  62 +config LIRC_RPI
  63 +       tristate "Homebrew GPIO Port Receiver/Transmitter for the RaspberryPi"
  64 +       depends on LIRC
  65 +       help
  66 +         Driver for Homebrew GPIO Port Receiver/Transmitter for the RaspberryPi
  67 +
  68  config LIRC_SASEM
  69         tristate "Sasem USB IR Remote"
  70         depends on LIRC && USB
  71 --- a/drivers/staging/media/lirc/Makefile
  72 +++ b/drivers/staging/media/lirc/Makefile
  73 @@ -6,6 +6,7 @@
  74  obj-$(CONFIG_LIRC_BT829)       += lirc_bt829.o
  75  obj-$(CONFIG_LIRC_IMON)                += lirc_imon.o
  76  obj-$(CONFIG_LIRC_PARALLEL)    += lirc_parallel.o
  77 +obj-$(CONFIG_LIRC_RPI)         += lirc_rpi.o
  78  obj-$(CONFIG_LIRC_SASEM)       += lirc_sasem.o
  79  obj-$(CONFIG_LIRC_SERIAL)      += lirc_serial.o
  80  obj-$(CONFIG_LIRC_SIR)         += lirc_sir.o
  81 --- /dev/null
  82 +++ b/drivers/staging/media/lirc/lirc_rpi.c
  83 @@ -0,0 +1,765 @@
  84 +/*
  85 + * lirc_rpi.c
  86 + *
  87 + * lirc_rpi - Device driver that records pulse- and pause-lengths
  88 + *           (space-lengths) (just like the lirc_serial driver does)
  89 + *           between GPIO interrupt events on the Raspberry Pi.
  90 + *           Lots of code has been taken from the lirc_serial module,
  91 + *           so I would like say thanks to the authors.
  92 + *
  93 + * Copyright (C) 2012 Aron Robert Szabo <aron@reon.hu>,
  94 + *                   Michael Bishop <cleverca22@gmail.com>
  95 + *  This program is free software; you can redistribute it and/or modify
  96 + *  it under the terms of the GNU General Public License as published by
  97 + *  the Free Software Foundation; either version 2 of the License, or
  98 + *  (at your option) any later version.
  99 + *
 100 + *  This program is distributed in the hope that it will be useful,
 101 + *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 102 + *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 103 + *  GNU General Public License for more details.
 104 + *
 105 + *  You should have received a copy of the GNU General Public License
 106 + *  along with this program; if not, write to the Free Software
 107 + *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 108 + */
 109 +
 110 +#include <linux/module.h>
 111 +#include <linux/errno.h>
 112 +#include <linux/interrupt.h>
 113 +#include <linux/sched.h>
 114 +#include <linux/kernel.h>
 115 +#include <linux/time.h>
 116 +#include <linux/timex.h>
 117 +#include <linux/timekeeping.h>
 118 +#include <linux/string.h>
 119 +#include <linux/delay.h>
 120 +#include <linux/platform_device.h>
 121 +#include <linux/irq.h>
 122 +#include <linux/spinlock.h>
 123 +#include <media/lirc.h>
 124 +#include <media/lirc_dev.h>
 125 +#include <mach/gpio.h>
 126 +#include <linux/gpio.h>
 127 +#include <linux/of_platform.h>
 128 +
 129 +#include <linux/platform_data/bcm2708.h>
 130 +
 131 +#define LIRC_DRIVER_NAME "lirc_rpi"
 132 +#define RBUF_LEN 256
 133 +#define LIRC_TRANSMITTER_LATENCY 50
 134 +
 135 +#ifndef MAX_UDELAY_MS
 136 +#define MAX_UDELAY_US 5000
 137 +#else
 138 +#define MAX_UDELAY_US (MAX_UDELAY_MS*1000)
 139 +#endif
 140 +
 141 +#define dprintk(fmt, args...)                                  \
 142 +       do {                                                    \
 143 +               if (debug)                                      \
 144 +                       printk(KERN_DEBUG LIRC_DRIVER_NAME ": " \
 145 +                              fmt, ## args);                   \
 146 +       } while (0)
 147 +
 148 +/* module parameters */
 149 +
 150 +/* set the default GPIO input pin */
 151 +static int gpio_in_pin = 18;
 152 +/* set the default pull behaviour for input pin */
 153 +static int gpio_in_pull = BCM2708_PULL_DOWN;
 154 +/* set the default GPIO output pin */
 155 +static int gpio_out_pin = 17;
 156 +/* enable debugging messages */
 157 +static bool debug;
 158 +/* -1 = auto, 0 = active high, 1 = active low */
 159 +static int sense = -1;
 160 +/* use softcarrier by default */
 161 +static bool softcarrier = 1;
 162 +/* 0 = do not invert output, 1 = invert output */
 163 +static bool invert = 0;
 164 +
 165 +struct gpio_chip *gpiochip;
 166 +static int irq_num;
 167 +
 168 +/* forward declarations */
 169 +static long send_pulse(unsigned long length);
 170 +static void send_space(long length);
 171 +static void lirc_rpi_exit(void);
 172 +
 173 +static struct platform_device *lirc_rpi_dev;
 174 +static struct timeval lasttv = { 0, 0 };
 175 +static struct lirc_buffer rbuf;
 176 +static spinlock_t lock;
 177 +
 178 +/* initialized/set in init_timing_params() */
 179 +static unsigned int freq = 38000;
 180 +static unsigned int duty_cycle = 50;
 181 +static unsigned long period;
 182 +static unsigned long pulse_width;
 183 +static unsigned long space_width;
 184 +
 185 +static void safe_udelay(unsigned long usecs)
 186 +{
 187 +       while (usecs > MAX_UDELAY_US) {
 188 +               udelay(MAX_UDELAY_US);
 189 +               usecs -= MAX_UDELAY_US;
 190 +       }
 191 +       udelay(usecs);
 192 +}
 193 +
 194 +static unsigned long read_current_us(void)
 195 +{
 196 +       struct timespec now;
 197 +       getnstimeofday(&now);
 198 +       return (now.tv_sec * 1000000) + (now.tv_nsec/1000);
 199 +}
 200 +
 201 +static int init_timing_params(unsigned int new_duty_cycle,
 202 +       unsigned int new_freq)
 203 +{
 204 +       if (1000 * 1000000L / new_freq * new_duty_cycle / 100 <=
 205 +           LIRC_TRANSMITTER_LATENCY)
 206 +               return -EINVAL;
 207 +       if (1000 * 1000000L / new_freq * (100 - new_duty_cycle) / 100 <=
 208 +           LIRC_TRANSMITTER_LATENCY)
 209 +               return -EINVAL;
 210 +       duty_cycle = new_duty_cycle;
 211 +       freq = new_freq;
 212 +       period = 1000 * 1000000L / freq;
 213 +       pulse_width = period * duty_cycle / 100;
 214 +       space_width = period - pulse_width;
 215 +       dprintk("in init_timing_params, freq=%d pulse=%ld, "
 216 +               "space=%ld\n", freq, pulse_width, space_width);
 217 +       return 0;
 218 +}
 219 +
 220 +static long send_pulse_softcarrier(unsigned long length)
 221 +{
 222 +       int flag;
 223 +       unsigned long actual, target;
 224 +       unsigned long actual_us, initial_us, target_us;
 225 +
 226 +       length *= 1000;
 227 +
 228 +       actual = 0; target = 0; flag = 0;
 229 +       actual_us = read_current_us();
 230 +
 231 +       while (actual < length) {
 232 +               if (flag) {
 233 +                       gpiochip->set(gpiochip, gpio_out_pin, invert);
 234 +                       target += space_width;
 235 +               } else {
 236 +                       gpiochip->set(gpiochip, gpio_out_pin, !invert);
 237 +                       target += pulse_width;
 238 +               }
 239 +               initial_us = actual_us;
 240 +               target_us = actual_us + (target - actual) / 1000;
 241 +               /*
 242 +                * Note - we've checked in ioctl that the pulse/space
 243 +                * widths are big enough so that d is > 0
 244 +                */
 245 +               if  ((int)(target_us - actual_us) > 0)
 246 +                       udelay(target_us - actual_us);
 247 +               actual_us = read_current_us();
 248 +               actual += (actual_us - initial_us) * 1000;
 249 +               flag = !flag;
 250 +       }
 251 +       return (actual-length) / 1000;
 252 +}
 253 +
 254 +static long send_pulse(unsigned long length)
 255 +{
 256 +       if (length <= 0)
 257 +               return 0;
 258 +
 259 +       if (softcarrier) {
 260 +               return send_pulse_softcarrier(length);
 261 +       } else {
 262 +               gpiochip->set(gpiochip, gpio_out_pin, !invert);
 263 +               safe_udelay(length);
 264 +               return 0;
 265 +       }
 266 +}
 267 +
 268 +static void send_space(long length)
 269 +{
 270 +       gpiochip->set(gpiochip, gpio_out_pin, invert);
 271 +       if (length <= 0)
 272 +               return;
 273 +       safe_udelay(length);
 274 +}
 275 +
 276 +static void rbwrite(int l)
 277 +{
 278 +       if (lirc_buffer_full(&rbuf)) {
 279 +               /* no new signals will be accepted */
 280 +               dprintk("Buffer overrun\n");
 281 +               return;
 282 +       }
 283 +       lirc_buffer_write(&rbuf, (void *)&l);
 284 +}
 285 +
 286 +static void frbwrite(int l)
 287 +{
 288 +       /* simple noise filter */
 289 +       static int pulse, space;
 290 +       static unsigned int ptr;
 291 +
 292 +       if (ptr > 0 && (l & PULSE_BIT)) {
 293 +               pulse += l & PULSE_MASK;
 294 +               if (pulse > 250) {
 295 +                       rbwrite(space);
 296 +                       rbwrite(pulse | PULSE_BIT);
 297 +                       ptr = 0;
 298 +                       pulse = 0;
 299 +               }
 300 +               return;
 301 +       }
 302 +       if (!(l & PULSE_BIT)) {
 303 +               if (ptr == 0) {
 304 +                       if (l > 20000) {
 305 +                               space = l;
 306 +                               ptr++;
 307 +                               return;
 308 +                       }
 309 +               } else {
 310 +                       if (l > 20000) {
 311 +                               space += pulse;
 312 +                               if (space > PULSE_MASK)
 313 +                                       space = PULSE_MASK;
 314 +                               space += l;
 315 +                               if (space > PULSE_MASK)
 316 +                                       space = PULSE_MASK;
 317 +                               pulse = 0;
 318 +                               return;
 319 +                       }
 320 +                       rbwrite(space);
 321 +                       rbwrite(pulse | PULSE_BIT);
 322 +                       ptr = 0;
 323 +                       pulse = 0;
 324 +               }
 325 +       }
 326 +       rbwrite(l);
 327 +}
 328 +
 329 +static irqreturn_t irq_handler(int i, void *blah, struct pt_regs *regs)
 330 +{
 331 +       struct timeval tv;
 332 +       long deltv;
 333 +       int data;
 334 +       int signal;
 335 +
 336 +       /* use the GPIO signal level */
 337 +       signal = gpiochip->get(gpiochip, gpio_in_pin);
 338 +
 339 +       if (sense != -1) {
 340 +               /* get current time */
 341 +               do_gettimeofday(&tv);
 342 +
 343 +               /* calc time since last interrupt in microseconds */
 344 +               deltv = tv.tv_sec-lasttv.tv_sec;
 345 +               if (tv.tv_sec < lasttv.tv_sec ||
 346 +                   (tv.tv_sec == lasttv.tv_sec &&
 347 +                    tv.tv_usec < lasttv.tv_usec)) {
 348 +                       printk(KERN_WARNING LIRC_DRIVER_NAME
 349 +                              ": AIEEEE: your clock just jumped backwards\n");
 350 +                       printk(KERN_WARNING LIRC_DRIVER_NAME
 351 +                              ": %d %d %lx %lx %lx %lx\n", signal, sense,
 352 +                              tv.tv_sec, lasttv.tv_sec,
 353 +                              tv.tv_usec, lasttv.tv_usec);
 354 +                       data = PULSE_MASK;
 355 +               } else if (deltv > 15) {
 356 +                       data = PULSE_MASK; /* really long time */
 357 +                       if (!(signal^sense)) {
 358 +                               /* sanity check */
 359 +                               printk(KERN_WARNING LIRC_DRIVER_NAME
 360 +                                      ": AIEEEE: %d %d %lx %lx %lx %lx\n",
 361 +                                      signal, sense, tv.tv_sec, lasttv.tv_sec,
 362 +                                      tv.tv_usec, lasttv.tv_usec);
 363 +                               /*
 364 +                                * detecting pulse while this
 365 +                                * MUST be a space!
 366 +                                */
 367 +                               sense = sense ? 0 : 1;
 368 +                       }
 369 +               } else {
 370 +                       data = (int) (deltv*1000000 +
 371 +                                     (tv.tv_usec - lasttv.tv_usec));
 372 +               }
 373 +               frbwrite(signal^sense ? data : (data|PULSE_BIT));
 374 +               lasttv = tv;
 375 +               wake_up_interruptible(&rbuf.wait_poll);
 376 +       }
 377 +
 378 +       return IRQ_HANDLED;
 379 +}
 380 +
 381 +static int is_right_chip(struct gpio_chip *chip, void *data)
 382 +{
 383 +       dprintk("is_right_chip %s %d\n", chip->label, strcmp(data, chip->label));
 384 +
 385 +       if (strcmp(data, chip->label) == 0)
 386 +               return 1;
 387 +       return 0;
 388 +}
 389 +
 390 +static inline int read_bool_property(const struct device_node *np,
 391 +                                    const char *propname,
 392 +                                    bool *out_value)
 393 +{
 394 +       u32 value = 0;
 395 +       int err = of_property_read_u32(np, propname, &value);
 396 +       if (err == 0)
 397 +               *out_value = (value != 0);
 398 +       return err;
 399 +}
 400 +
 401 +static void read_pin_settings(struct device_node *node)
 402 +{
 403 +       u32 pin;
 404 +       int index;
 405 +
 406 +       for (index = 0;
 407 +            of_property_read_u32_index(
 408 +                    node,
 409 +                    "brcm,pins",
 410 +                    index,
 411 +                    &pin) == 0;
 412 +            index++) {
 413 +               u32 function;
 414 +               int err;
 415 +               err = of_property_read_u32_index(
 416 +                       node,
 417 +                       "brcm,function",
 418 +                       index,
 419 +                       &function);
 420 +               if (err == 0) {
 421 +                       if (function == 1) /* Output */
 422 +                               gpio_out_pin = pin;
 423 +                       else if (function == 0) /* Input */
 424 +                               gpio_in_pin = pin;
 425 +               }
 426 +       }
 427 +}
 428 +
 429 +static int init_port(void)
 430 +{
 431 +       int i, nlow, nhigh, ret;
 432 +       struct device_node *node;
 433 +
 434 +       node = lirc_rpi_dev->dev.of_node;
 435 +
 436 +       gpiochip = gpiochip_find("bcm2708_gpio", is_right_chip);
 437 +
 438 +       /*
 439 +        * Because of the lack of a setpull function, only support
 440 +        * pinctrl-bcm2835 if using device tree.
 441 +       */
 442 +       if (!gpiochip && node)
 443 +               gpiochip = gpiochip_find("pinctrl-bcm2835", is_right_chip);
 444 +
 445 +       if (!gpiochip) {
 446 +               pr_err(LIRC_DRIVER_NAME ": gpio chip not found!\n");
 447 +               return -ENODEV;
 448 +       }
 449 +
 450 +       if (node) {
 451 +               struct device_node *pins_node;
 452 +
 453 +               pins_node = of_parse_phandle(node, "pinctrl-0", 0);
 454 +               if (!pins_node) {
 455 +                       printk(KERN_ERR LIRC_DRIVER_NAME
 456 +                              ": pinctrl settings not found!\n");
 457 +                       ret = -EINVAL;
 458 +                       goto exit_init_port;
 459 +               }
 460 +
 461 +               read_pin_settings(pins_node);
 462 +
 463 +               of_property_read_u32(node, "rpi,sense", &sense);
 464 +
 465 +               read_bool_property(node, "rpi,softcarrier", &softcarrier);
 466 +
 467 +               read_bool_property(node, "rpi,invert", &invert);
 468 +
 469 +               read_bool_property(node, "rpi,debug", &debug);
 470 +
 471 +       }
 472 +       else
 473 +       {
 474 +               if (gpio_in_pin >= BCM2708_NR_GPIOS ||
 475 +                   gpio_out_pin >= BCM2708_NR_GPIOS) {
 476 +                       ret = -EINVAL;
 477 +                       printk(KERN_ERR LIRC_DRIVER_NAME
 478 +                              ": invalid GPIO pin(s) specified!\n");
 479 +                       goto exit_init_port;
 480 +               }
 481 +
 482 +               if (gpio_request(gpio_out_pin, LIRC_DRIVER_NAME " ir/out")) {
 483 +                       printk(KERN_ALERT LIRC_DRIVER_NAME
 484 +                              ": cant claim gpio pin %d\n", gpio_out_pin);
 485 +                       ret = -ENODEV;
 486 +                       goto exit_init_port;
 487 +               }
 488 +
 489 +               if (gpio_request(gpio_in_pin, LIRC_DRIVER_NAME " ir/in")) {
 490 +                       printk(KERN_ALERT LIRC_DRIVER_NAME
 491 +                              ": cant claim gpio pin %d\n", gpio_in_pin);
 492 +                       ret = -ENODEV;
 493 +                       goto exit_gpio_free_out_pin;
 494 +               }
 495 +
 496 +               bcm2708_gpio_setpull(gpiochip, gpio_in_pin, gpio_in_pull);
 497 +               gpiochip->direction_input(gpiochip, gpio_in_pin);
 498 +               gpiochip->direction_output(gpiochip, gpio_out_pin, 1);
 499 +       }
 500 +
 501 +       gpiochip->set(gpiochip, gpio_out_pin, invert);
 502 +
 503 +       irq_num = gpiochip->to_irq(gpiochip, gpio_in_pin);
 504 +       dprintk("to_irq %d\n", irq_num);
 505 +
 506 +       /* if pin is high, then this must be an active low receiver. */
 507 +       if (sense == -1) {
 508 +               /* wait 1/2 sec for the power supply */
 509 +               msleep(500);
 510 +
 511 +               /*
 512 +                * probe 9 times every 0.04s, collect "votes" for
 513 +                * active high/low
 514 +                */
 515 +               nlow = 0;
 516 +               nhigh = 0;
 517 +               for (i = 0; i < 9; i++) {
 518 +                       if (gpiochip->get(gpiochip, gpio_in_pin))
 519 +                               nlow++;
 520 +                       else
 521 +                               nhigh++;
 522 +                       msleep(40);
 523 +               }
 524 +               sense = (nlow >= nhigh ? 1 : 0);
 525 +               printk(KERN_INFO LIRC_DRIVER_NAME
 526 +                      ": auto-detected active %s receiver on GPIO pin %d\n",
 527 +                      sense ? "low" : "high", gpio_in_pin);
 528 +       } else {
 529 +               printk(KERN_INFO LIRC_DRIVER_NAME
 530 +                      ": manually using active %s receiver on GPIO pin %d\n",
 531 +                      sense ? "low" : "high", gpio_in_pin);
 532 +       }
 533 +
 534 +       return 0;
 535 +
 536 +       exit_gpio_free_out_pin:
 537 +       gpio_free(gpio_out_pin);
 538 +
 539 +       exit_init_port:
 540 +       return ret;
 541 +}
 542 +
 543 +// called when the character device is opened
 544 +static int set_use_inc(void *data)
 545 +{
 546 +       int result;
 547 +
 548 +       /* initialize timestamp */
 549 +       do_gettimeofday(&lasttv);
 550 +
 551 +       result = request_irq(irq_num,
 552 +                            (irq_handler_t) irq_handler,
 553 +                            IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING,
 554 +                            LIRC_DRIVER_NAME, (void*) 0);
 555 +
 556 +       switch (result) {
 557 +       case -EBUSY:
 558 +               printk(KERN_ERR LIRC_DRIVER_NAME
 559 +                      ": IRQ %d is busy\n",
 560 +                      irq_num);
 561 +               return -EBUSY;
 562 +       case -EINVAL:
 563 +               printk(KERN_ERR LIRC_DRIVER_NAME
 564 +                      ": Bad irq number or handler\n");
 565 +               return -EINVAL;
 566 +       default:
 567 +               dprintk("Interrupt %d obtained\n",
 568 +                       irq_num);
 569 +               break;
 570 +       };
 571 +
 572 +       /* initialize pulse/space widths */
 573 +       init_timing_params(duty_cycle, freq);
 574 +
 575 +       return 0;
 576 +}
 577 +
 578 +static void set_use_dec(void *data)
 579 +{
 580 +       /* GPIO Pin Falling/Rising Edge Detect Disable */
 581 +       irq_set_irq_type(irq_num, 0);
 582 +       disable_irq(irq_num);
 583 +
 584 +       free_irq(irq_num, (void *) 0);
 585 +
 586 +       dprintk(KERN_INFO LIRC_DRIVER_NAME
 587 +               ": freed IRQ %d\n", irq_num);
 588 +}
 589 +
 590 +static ssize_t lirc_write(struct file *file, const char *buf,
 591 +       size_t n, loff_t *ppos)
 592 +{
 593 +       int i, count;
 594 +       unsigned long flags;
 595 +       long delta = 0;
 596 +       int *wbuf;
 597 +
 598 +       count = n / sizeof(int);
 599 +       if (n % sizeof(int) || count % 2 == 0)
 600 +               return -EINVAL;
 601 +       wbuf = memdup_user(buf, n);
 602 +       if (IS_ERR(wbuf))
 603 +               return PTR_ERR(wbuf);
 604 +       spin_lock_irqsave(&lock, flags);
 605 +
 606 +       for (i = 0; i < count; i++) {
 607 +               if (i%2)
 608 +                       send_space(wbuf[i] - delta);
 609 +               else
 610 +                       delta = send_pulse(wbuf[i]);
 611 +       }
 612 +       gpiochip->set(gpiochip, gpio_out_pin, invert);
 613 +
 614 +       spin_unlock_irqrestore(&lock, flags);
 615 +       kfree(wbuf);
 616 +       return n;
 617 +}
 618 +
 619 +static long lirc_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
 620 +{
 621 +       int result;
 622 +       __u32 value;
 623 +
 624 +       switch (cmd) {
 625 +       case LIRC_GET_SEND_MODE:
 626 +               return -ENOIOCTLCMD;
 627 +               break;
 628 +
 629 +       case LIRC_SET_SEND_MODE:
 630 +               result = get_user(value, (__u32 *) arg);
 631 +               if (result)
 632 +                       return result;
 633 +               /* only LIRC_MODE_PULSE supported */
 634 +               if (value != LIRC_MODE_PULSE)
 635 +                       return -ENOSYS;
 636 +               break;
 637 +
 638 +       case LIRC_GET_LENGTH:
 639 +               return -ENOSYS;
 640 +               break;
 641 +
 642 +       case LIRC_SET_SEND_DUTY_CYCLE:
 643 +               dprintk("SET_SEND_DUTY_CYCLE\n");
 644 +               result = get_user(value, (__u32 *) arg);
 645 +               if (result)
 646 +                       return result;
 647 +               if (value <= 0 || value > 100)
 648 +                       return -EINVAL;
 649 +               return init_timing_params(value, freq);
 650 +               break;
 651 +
 652 +       case LIRC_SET_SEND_CARRIER:
 653 +               dprintk("SET_SEND_CARRIER\n");
 654 +               result = get_user(value, (__u32 *) arg);
 655 +               if (result)
 656 +                       return result;
 657 +               if (value > 500000 || value < 20000)
 658 +                       return -EINVAL;
 659 +               return init_timing_params(duty_cycle, value);
 660 +               break;
 661 +
 662 +       default:
 663 +               return lirc_dev_fop_ioctl(filep, cmd, arg);
 664 +       }
 665 +       return 0;
 666 +}
 667 +
 668 +static const struct file_operations lirc_fops = {
 669 +       .owner          = THIS_MODULE,
 670 +       .write          = lirc_write,
 671 +       .unlocked_ioctl = lirc_ioctl,
 672 +       .read           = lirc_dev_fop_read,
 673 +       .poll           = lirc_dev_fop_poll,
 674 +       .open           = lirc_dev_fop_open,
 675 +       .release        = lirc_dev_fop_close,
 676 +       .llseek         = no_llseek,
 677 +};
 678 +
 679 +static struct lirc_driver driver = {
 680 +       .name           = LIRC_DRIVER_NAME,
 681 +       .minor          = -1,
 682 +       .code_length    = 1,
 683 +       .sample_rate    = 0,
 684 +       .data           = NULL,
 685 +       .add_to_buf     = NULL,
 686 +       .rbuf           = &rbuf,
 687 +       .set_use_inc    = set_use_inc,
 688 +       .set_use_dec    = set_use_dec,
 689 +       .fops           = &lirc_fops,
 690 +       .dev            = NULL,
 691 +       .owner          = THIS_MODULE,
 692 +};
 693 +
 694 +static const struct of_device_id lirc_rpi_of_match[] = {
 695 +       { .compatible = "rpi,lirc-rpi", },
 696 +       {},
 697 +};
 698 +MODULE_DEVICE_TABLE(of, lirc_rpi_of_match);
 699 +
 700 +static struct platform_driver lirc_rpi_driver = {
 701 +       .driver = {
 702 +               .name   = LIRC_DRIVER_NAME,
 703 +               .owner  = THIS_MODULE,
 704 +               .of_match_table = of_match_ptr(lirc_rpi_of_match),
 705 +       },
 706 +};
 707 +
 708 +static int __init lirc_rpi_init(void)
 709 +{
 710 +       struct device_node *node;
 711 +       int result;
 712 +
 713 +       /* Init read buffer. */
 714 +       result = lirc_buffer_init(&rbuf, sizeof(int), RBUF_LEN);
 715 +       if (result < 0)
 716 +               return -ENOMEM;
 717 +
 718 +       result = platform_driver_register(&lirc_rpi_driver);
 719 +       if (result) {
 720 +               printk(KERN_ERR LIRC_DRIVER_NAME
 721 +                      ": lirc register returned %d\n", result);
 722 +               goto exit_buffer_free;
 723 +       }
 724 +
 725 +       node = of_find_compatible_node(NULL, NULL,
 726 +                                      lirc_rpi_of_match[0].compatible);
 727 +
 728 +       if (node) {
 729 +               /* DT-enabled */
 730 +               lirc_rpi_dev = of_find_device_by_node(node);
 731 +               WARN_ON(lirc_rpi_dev->dev.of_node != node);
 732 +               of_node_put(node);
 733 +       }
 734 +       else {
 735 +               lirc_rpi_dev = platform_device_alloc(LIRC_DRIVER_NAME, 0);
 736 +               if (!lirc_rpi_dev) {
 737 +                       result = -ENOMEM;
 738 +                       goto exit_driver_unregister;
 739 +               }
 740 +
 741 +               result = platform_device_add(lirc_rpi_dev);
 742 +               if (result)
 743 +                       goto exit_device_put;
 744 +       }
 745 +
 746 +       return 0;
 747 +
 748 +       exit_device_put:
 749 +       platform_device_put(lirc_rpi_dev);
 750 +
 751 +       exit_driver_unregister:
 752 +       platform_driver_unregister(&lirc_rpi_driver);
 753 +
 754 +       exit_buffer_free:
 755 +       lirc_buffer_free(&rbuf);
 756 +
 757 +       return result;
 758 +}
 759 +
 760 +static void lirc_rpi_exit(void)
 761 +{
 762 +       if (!lirc_rpi_dev->dev.of_node)
 763 +               platform_device_unregister(lirc_rpi_dev);
 764 +       platform_driver_unregister(&lirc_rpi_driver);
 765 +       lirc_buffer_free(&rbuf);
 766 +}
 767 +
 768 +static int __init lirc_rpi_init_module(void)
 769 +{
 770 +       int result;
 771 +
 772 +       result = lirc_rpi_init();
 773 +       if (result)
 774 +               return result;
 775 +
 776 +       result = init_port();
 777 +       if (result < 0)
 778 +               goto exit_rpi;
 779 +
 780 +       driver.features = LIRC_CAN_SET_SEND_DUTY_CYCLE |
 781 +                         LIRC_CAN_SET_SEND_CARRIER |
 782 +                         LIRC_CAN_SEND_PULSE |
 783 +                         LIRC_CAN_REC_MODE2;
 784 +
 785 +       driver.dev = &lirc_rpi_dev->dev;
 786 +       driver.minor = lirc_register_driver(&driver);
 787 +
 788 +       if (driver.minor < 0) {
 789 +               printk(KERN_ERR LIRC_DRIVER_NAME
 790 +                      ": device registration failed with %d\n", result);
 791 +               result = -EIO;
 792 +               goto exit_rpi;
 793 +       }
 794 +
 795 +       printk(KERN_INFO LIRC_DRIVER_NAME ": driver registered!\n");
 796 +
 797 +       return 0;
 798 +
 799 +       exit_rpi:
 800 +       lirc_rpi_exit();
 801 +
 802 +       return result;
 803 +}
 804 +
 805 +static void __exit lirc_rpi_exit_module(void)
 806 +{
 807 +       lirc_unregister_driver(driver.minor);
 808 +
 809 +       gpio_free(gpio_out_pin);
 810 +       gpio_free(gpio_in_pin);
 811 +
 812 +       lirc_rpi_exit();
 813 +
 814 +       printk(KERN_INFO LIRC_DRIVER_NAME ": cleaned up module\n");
 815 +}
 816 +
 817 +module_init(lirc_rpi_init_module);
 818 +module_exit(lirc_rpi_exit_module);
 819 +
 820 +MODULE_DESCRIPTION("Infra-red receiver and blaster driver for Raspberry Pi GPIO.");
 821 +MODULE_AUTHOR("Aron Robert Szabo <aron@reon.hu>");
 822 +MODULE_AUTHOR("Michael Bishop <cleverca22@gmail.com>");
 823 +MODULE_LICENSE("GPL");
 824 +
 825 +module_param(gpio_out_pin, int, S_IRUGO);
 826 +MODULE_PARM_DESC(gpio_out_pin, "GPIO output/transmitter pin number of the BCM"
 827 +                " processor. (default 17");
 828 +
 829 +module_param(gpio_in_pin, int, S_IRUGO);
 830 +MODULE_PARM_DESC(gpio_in_pin, "GPIO input pin number of the BCM processor."
 831 +                " (default 18");
 832 +
 833 +module_param(gpio_in_pull, int, S_IRUGO);
 834 +MODULE_PARM_DESC(gpio_in_pull, "GPIO input pin pull configuration."
 835 +                " (0 = off, 1 = up, 2 = down, default down)");
 836 +
 837 +module_param(sense, int, S_IRUGO);
 838 +MODULE_PARM_DESC(sense, "Override autodetection of IR receiver circuit"
 839 +                " (0 = active high, 1 = active low )");
 840 +
 841 +module_param(softcarrier, bool, S_IRUGO);
 842 +MODULE_PARM_DESC(softcarrier, "Software carrier (0 = off, 1 = on, default on)");
 843 +
 844 +module_param(invert, bool, S_IRUGO);
 845 +MODULE_PARM_DESC(invert, "Invert output (0 = off, 1 = on, default off");
 846 +
 847 +module_param(debug, bool, S_IRUGO | S_IWUSR);
 848 +MODULE_PARM_DESC(debug, "Enable debugging messages");